Electric cooking apparatus



June 3, 1969 v. M. BERGER ET AL 3,447,444

ELECTRIC COOKING APPARATUS Original Filed Nov. 30, 1964 Sheet of 3INVENT R5 Mme/ll 0 m ATTORNEYS June 3, 1969 v. M. BERGER ET AL 3,447,444

ELECTRIC COOKING APPARATUS Original Filed Nov. 30, 1964 Sheet 3 /4 H HI] H H II [I II I] I] [I II I] ll IT [I I] H I 146g) WE-iw BY Dwwsy A.A'ZHe'ia Sheet of 3 June 3, 1969 v. M. BERGER ET L ELECTRIC COOKINGAPPARATUS Original Filed Nov. 30, 1964 Haw Q 3 \Q 4? 4 ms w WWAW s WMWUQ03 m a @Q ,4 H .4 W m mm mm 4 VM v, V, m Nf E T United States Patent3,447,444 ELECTRIC COOKING APPARATUS Victor M. Berger, Bayside, andSidney A. Scherer, Bronx, N.Y., assignors to Electro-Char Corporation,New York, N.Y., a corporation of New York Original application Nov. 30,1964, Ser. No. 414,747, now Patent No. 3,350,543, dated Oct. 31, 1967.Divided and this application Aug. 1, 1967, Ser. No. 664,588

Int. Cl. F24c 7/06 US. Cl. 99-340 4 Claims ABSTRACT OF THE DISCLOSURE Anelectrified cooking apparatus which is open at the top and at the frontwith two electrified cooking grates which are mounted within theapparatus, with one located near the top and the other spaced below theone mounted near the top, with one of the electrified grates beingmovable toward or away from the other grate so that food placed on thelower grate can selectively be cooked by the upper and lower grates.

This is a division of application Ser. No. 414,747, filed Nov. 30, 1964,now Patent No. 3,350,543.

This invention relates to improvements in electric cooking apparatus andin particular relates to apparatus incorporating an electrified cookinggrate of the type disclosed in prior US. patents to Savio, No. 2,938,102and No. 3,022,410.

One object of the invention is to provide an electrified cooking gratewhich is easy to assembly and disassemble to facilitate repairs in thefield.

Another object of this invention is to provide an improved electriccooking apparatus, incorporating an electrified cooking grate, inconjunction with auxiliary electric cooking devices, all cooperating tofacilitate the use of the apparatus for a great variety of cookingpurposes.

In the aforesaid US. Patent No. 2,938,102, there is disclosed anelectrified cooking grate, the frame of which has a central opening withopposed end walls having a plurality of spaced apertures. A plurality ofheating elements each comprising a generally straight metal tube,containing a wire, extend across the opening in spaced, generallyparallel relationship with the ends of each tube respectively extendinginto end wall apertures and sealed therein against the passage ofgrease, liquids and the like. The upper surfaces of the tubes aregenerally coplanar to provide a cooking surface, the space between,immediately above and immediately below the tubes being unobstructed topermit placing food directly upon the cooking surface and to permit freeflow of air around the tubes.

Customarily, the tubes of the electrified heating grate are divided intogroups or sections, the electrical connections being such that each suchgroup or section can be independently electrically controlled. Thus, incommercial apparatus, there may be, by way of example, four groups ofheating tubes, with eight tubes in each group. Occasionally, theelectric wire in one of the tubes may become burned out or may otherwisefail. In the past, this has necessitated disassembly of the electrifiedcooking grate and replacement of the single tube, a task frequentlybeyond the skill of the repairman in the field.

In accordance with the invention, the electrified grate is constructedso that each separately controlled group or set of heating elements canbe separately removed and replaced as a unit, with a minimum ofdifnculty.

Another object of the invention is to provide a housing support andwiring raceways for the electrified cooking grate, such that on the onehand, the wiring is readily ac- 3,447,444 Patented June 3, 1969 cessiblefor disconnection when a grate section is to be replaced, and on theother hand, the wiring is drawn through the housing to the bottomthereof, with the controls located at the bottom of the housing, thisbeing the zone of minimum heat from the electrified cooking grate.

Other objects and advantages of the invention will become apparent fromthe following description, in conjunction with the annexed drawing inwhich preferred embodiments of the invention are disclosed.

In the drawing,

FIG. 1 is a front elevation of a broiler in accordance with a firstembodiment of the invention.

FIG. 2 is a side elevation of the broiler of FIG. 1 showing theelectrified grate in broken lines in two possible raised positionsthereof.

FIG. 3 is a top plan view of the broiler.

FIG. 4 is a longitudinal section on line 44 of FIG. 1.

FIG. 5 is a transverse vertical section on line 5-5 of FIG. 4.

FIG. 6 is a fragmentary longitudinal vertical section, broken away,showing a removable section of the electrified cooking grate.

FIG. 7 is a section on line 77 of FIG. 6.

FIG. 8 is a section on line 8-8 of FIG. 6.

FIG. 9 is a schematic electric circuit diagram of the invention.

FIG. 10 is a somewhat diagrammatic front elevation of a secondembodiment of the invention.

FIG. 11 is a fragmentary view similar to FIG. 10 but with certain partsbroken away to show the internal construction.

Upon reference to the drawings in detail, and in particular to FIGS. 1-9thereof, it will be seen that the drawing shows a casing 10 havinghollow sidewall portions 12 with inner wall 12a, a hollow bottom casingwall portion 11 with upper wall 11a and rear hollow casing wall por tion13 with front wall 13a. The casing is generally rectangular, and thewall portions may have any suitable structure, such that the interiorspaces of such wall portions meet each other. The walls 12a, 11a and 13acooperate to form a well or recess 14. The upper wall 13b of the casingportion 13 is preferably located below the upper walls of the casingportions 12, as clearly shown in FIG. 4.

A rigidifying bar member '15 of any suitable construction is fixed toand extends between the walls 12a, at the front thereof, somewhat belowthe level of the upper walls of the casing portions 12, as shown in FIG.4. This element 15 may have any suitable construction and is spacedabove the recess floor 11a to define a front access opening 16 intorecess 14. A splash guard 15a, which extends slightly downwardly andrearwardly from the top of the element 15, may be interfitted with theelement 15 in any suitable way. The element 15, or more specifically theoverlying guard portion 15b, serves as a seat for the front end of thepivotal electrified cooking grate.

The rear end of the electrified cooking grate is supported by alaterally extending hollow casing 20 which is in turn pivotallyconnected to the casing sidewall portions 12. Casing 20 may befabricated in any suitable way to have a generally rectangular shape. Asshown, the casing 20 is formed from sheet metal which is cut and bent toform a vertical rear wall 21, bottom wall 22 and front wall 23. Theupper end of the front wall 23 connects with a forwardly extendinghorizontal panel 23a. Any suitable sidewalls 24 may be provided, by anysuitable means, to close the ends of the casing 20. The interior spaceof the casing 20 serves as a wiring raceway and junction box, which isclosed by a removable cover 27. In the illustrated construction, thecover 27 connects at its rear edge with a vertical panel 26 which 3bears frictionally flush against wall 21, and the front edge of cover 27extends frictionally against the wall 23 and further connects with adownwardly rearwardly extending flange 28.

Any suitable hollow pivot tube 29 is connected to each wall 24 andfurther extends turnably through any suitable opening in a wall 12a, theconstruction being such that the bore of tube 29 provides communicationbetween the interior space of casing 20 and the interior space of easingwall portion 12.

Each wall 24 has a vertical extension 24a extending forwardly of casing20. A rod 33 is fixedly connected between the extensions 24a, at thefront lower corners thereof. A pair of hook members 30 are provided,each having a sleeve 31 slidably and turnably mounted upon rod 33. A rod32 is fixed to sleeve 31 and extends transversely thereto. The outer endof rod 32 is ben outwardly to form a lateral arm 32a. When the casing 20is pivoted to an intermediate position (the broken line position of FIG.4 and the lowermost broken line position of FIG. 2), the sleeves 31 maybe slid outwardly on rod 33 and may be turned so as to bring the rodportions 32a through holes 321) formed in the respective walls 12aforwardly of the pivot 29, thereby releasably locking the casing 20 insuch intermediate elevated position, and thereby facilitating access tothe recess 14 under the electrified grate, for cleaning and servicingpurposes.

The electrified cooking grate 35 comprises a plurality of sections 36,each such section comprising a rear casing 37 releasably fixed to wall23 of casing 20, a front casing section 30 and heating tube elements 9extending between and connected to the casing sections 37 and 38.

The casing sections 37 and 38 are of quite similar construction, and arein turn somewhat similar to the structures shown in the aforesaid priorpatent to Savio, #3,022,4l0.

The casing 36 includes an extrusion shaped to provide a rear wall 40,top wall 42 and front boss 43, of increased thickness, depending fromwall 42. In addition, a horizontal flange 41 extends forwardly from wall40 adjacent the bottom thereof. A bottom plate 45 is fixed to flange 41by means of screws 46. A boss 44 is fixed to the upper face of plate 45adjacent the front thereof, by means of screws 47 in opposition to boss43 and cooperating therewith to define a front casing wall withapertures for reception of the tubes 9. Forwardly of such front wall,the plate 45 is extended downwardly forwardly to define a guard 48.

The casing 36 is fixed to wall 23 by conventional fittings commonly usedwith junction boxes. Specifically, a hollow screw-threaded shank 50having a nut head 51 is extended through respective openings in walls 40and 23 with head 51 against wall 40. Within the raceway of casing 20, anut 52 is screwed onto the screwthreaded shank 50 and against the wall23. The structure is such that a plurality of boxes or casings 36 may bemounted upon casing 20 with the sides of the boxes or casings 36 insubstantial abutment, four such casings being shown mounted in thedrawing. The outer sides of the outermost boxes 36 are substantiallyaligned with the sides of casing 20.

Each tube element 9 is hollow and has a flat upper surface 9a joined atits sides with a convex Wall 9b. A heating wire 8 extends through theinterior of the hollow tube 9. This element is conventional andreference is made to the aforesaid patents and to known practice tocomplete the disclosures thereof.

The element 44 has a series of notches 44a in its upper surface, thesenotches 44a having substantially the same contour as the tube wall 9b.The flat bottom surface of the element 43 has a pair of dependinglateral ribs 43a. A plurality of tubes 9, 8 being illustratively shownin the drawing, are located in a corresponding number of notches 44a,with the element 43 overriding the tops of the tubes and clamped to theelement 44 by means of a plurality of screws 53. The ribs 43:: dig intothe tube surface to insure good electrical contact between the casingand the tubes. The apertures in the wall 43, 44 through which the tubes9 extend is sealed by a sealing compound 54. Reference is made to theaforesaid Patent No. 3,022,410 to complete the disclosure in thisregard.

The tubes 9 extend into the interior space of the casing. In orderfurther to unite the casings of the tubes 9 electrically, a laterallyand vertically extending bar 55 is fixed to the tubes 9 in the interiorof the casing 36. Specifically, such bar 55 has notches 56 in its loweredge, into which the tubes 9 are forced. Intermediate the notches '56,the lower part of the bar 55 is sawtoothed so as to provide teeth 57 oneach side of the notch 56 which engage frictionally against the tubewall 9b.

The wires 8 within the tubes extend rearwardly thereof at 8a for thepurpose of electrical connections. Specifically, the two middle wires 8are connected by bus 58, and the next two wires on each side areconnected to each other in each instance by a bus wire 59. The extremeend wires 8 are connected by a bus wire 60. Wires 61 are respectivelyconnected to bus 58 and to bus 60 and are in turn connected to wires 62which are extended through the bore of element 50 and hence into theraceway of housing 20.

The front box 38 is quite similar to the rear box 37, with like partsdesignated by like reference characters, so that complete description isnot necessary. Of course, it will be understood that the orientation ofthe parts is reversed front to rear, as clearly shown in FIG. 6.

Within the interior of the box 38, the wires 8 are connected by a seriesof bus wires 63. As shown in FIG. 9, there are four such bus wires 63respectively connecting the two outermost wires 8 and the twointermediate pairs of wires 8. Thus, it will be seen that the heatingelements are connected in two series of four each with the two series inturn connected in parallel. However, it is obvious that any suitablewiring arrangement can be employed, that shown in the drawing beingpurely illustrative.

In order to secure the front boxes 38 together as a rigid unit, each ofthe walls thereof is formed with a lateral boss or tongue 65 near thetop thereof. The tongues 65 of the four boxes 38 are laterally aligned.A laterally extending channel member 67 has a groove 68 whichfrictionally receives the four tongues 65. The channel 67 has at itsbottom rear edge a downward extension 69 which abuts wall 40 and whichconnects at its lower end with a rearwardly extending flange 70 whichunderlies and a'buts wall 45.

The assembly of the electrified grate 36 may be completed by anysuitable trim. In the case of the front boxes 48, the trim may comprisea flat plate 71 which overlies the four boxes and which has a dependingperipheral flange 72 which abuts the rear wall 44 of the four boxes, thesides of the outermost boxes and the front of the channel 67. At thefront, the flange 72 may be secured by screws 73 to the front of channel67.

At the rear, a plate 74 may overlie the tops of the four boxes 37 aswell as the top of the housing 20. Such plate 74 may have a dependingedge flange 75 which abuts the fronts of the elements 43, above tubes49, and which also abuts the sides of the outermost boxes 37. At therear, plate 74 connects with a depending vertical panel 73a which abutsthe rear of housing 20 and which extends below the bottom housing all22, where it is provided with slots 76. Clips 77 are slidably secured tothe bottom of wall 22 by means of respective screws 78 extended throughlongitudinally extending slots 79 in the clips 77. The front end of eachclip 77 is extended downwardly at 80 for finger gripping, and the rearend of clip 77 is formed into a tongue 81 which extends into a notch 76,in the position shown in FIG. 6. It will be apparent that for release ofthe trim plate 74, the screw 78 may be loosened and the clip 77 movedforwardly by gripping of its flange 80, so as to draw the tongue 81 outof slot 76.

From the foregoing, it will be seen that we have provided a compositeelectrified grate structure 35 which may be used for cooking purposesentirely similarly to the structures of the aforesaid previous Patents#2,938,102 and #3,022,410. Further, the grate can be readily swung outof cooking position, in which its upper surface is horizontal and at thelevel of the top of the recess 14, to an upwardly tilted position forcleaning and servicing purposes. Furthermore, the electrified grate hasfour sections 36, each individually fabricated by means somewhat asshown in the aforesaid Patent No. 3,022,410, and each independentlymounted to the raceway housing 20. Accordingly, if any one of theseparately controlled sections 36 becomes inoperative, as by opening ofone of the wires therein, it is possible simply to remove the racewaycover, disconnect the two wires of the damaged section, remove the nut52 and replace the damaged section. Obviously, the removal of the trimto reach the damaged section for repair and replacement is a simplematter.

As a further feature of the invention, the electrical controls arelocated in the bottom casing section 11. To achieve this, a junctionblock 82 is fixed to the housing bottom wall 22 bymeans of the aforesaidscrews 78. The wires 62 are provided at their ends with conventionalfittings 85 which are extended upon conventional binding posts 86 on theupper surface of block 82, with the clips 85a of additional wires alsosecured to the posts 86, by means of nuts 88. The wires 87 associatedwith such clips 85a are further drawn through the main housing 10. Thus,when a grating section is damaged and it is to be replaced, it is onlynecessary to remove the nuts from two binding posts in order to detachthe wires 62 associated with such damaged section, which wires can thenbe drawn through the bore of the fitting 50. As shown somewhatdiagrammatically in FIG.. 4, the two wires 87 of each of the sections oneach side may be drawn through the fitting 29 and hence into the casingsides 12, from which the wires can extend to the bottom section 11. Thephysical arrangement of the wires and of the controls within the section11'is not shown since this is conventional and the existence thereofwill be obvious from the showing that is made. Specifically, FIG. 1shows control knobs 90 mounted upon the front panel 11b of the casingsection 11. As shown diagrammatically in FIG. 9, these knobs 90 controlconventional infinite controls 91 which are interposed in the respectivepairs of lines 87. Each control 91 connects a pair of lines 87 to afurther pair of lines 92, which are all connected in parallel with themain lines 93 which are in turn connected to any suitable source ofpower, not shown. By way of example, in the wiring diagram shown, thesource of power can be single phase 208 volt alternating current.However, as indicated above, any other suitable wiring arrangement canbe employed.

In the electric cooking apparatus of the aforesaid Patents #2,938,l02and #3,022,4l0, it was not possible to make any cooking use of the spacebelow the electrified grate. As a particular feature of this invention,a conventional broiling element is located below the electrified grate35, and structure is provided so as to protect such further cookingelement from the hot grease and oil which may drip downwardly from theelectrified grate. The additional heating element is in the form of aserpentine horizontal tube 100 which may have any suitable configurationsuch as the configuration shown in FIG. 3. This tube 100 contains aconventional heating wire 101. At the rear, the tube 100 is shaped toprovide parallel longitudinal legs 102 which are extended through wall13a and are secured thereto by any suitable fittings 104. The wire 101is represented electrically as a resistance in FIG. 9. The leads fromthe resistance wire 101, designated by the referance character 101a, areconnected respectively to the lines 93, one of the leads 101:: beingconnected through a snap-action lever switch 105, the operating lever ofwhich is shown at 106 on the panel 11b, in FIG. 1.

The tube 100 is further supported by a pair of lateral rods 106a whichextend across the recess 14 and are fixed to the respective sidewalls12a. It will be noted that the element is in longitudinal opposition tothe frame element 15, so as to minimize the risk of touching the hottube 100 when food is being brought into or out of the recess 14 throughthe access opening 16. The two rods 106 serve the further function ofsupporting a protective shield plate 107 which is located above the tube100 and below the tubes 9. This plate 107 is slightly downwardlyoutwardly inclined on each side of its longitudinal center line 108. Atits sides, the plate 107 is provided with depending flanges 109 havingbottom notches 110 which receive the rods 106 for support of the flanges109, the plate 107 being thereby spaced above the hot tubular heatingelement 100. It will be apparent that any greaes from the tubes 9strikes the inclined portions of the plate 107 and drips down on theouter sides of the flanges 109 to the cool zone below the tube 10.Additional guard elements in the form of longitudinally extending,downwardly inwardly inclined plates 110a are releasably secured to thewalls 12a adjacent the flanges 109. Specifi cally, the wall 12a isprovided in each instance with a slot, with the guard 110a having anextension 111 which may be hooked into the slot.

Below the tubular heating element 100, the respective walls are formedwith inwardly extending ribs 112 and 113, respectively, with the ribs112 at one level and the ribs 113 at a lower level serving as respectivetracks for reception of a conventional openwork grate unit 114 which maythereby be slid into and out of the recess 14 through the access opening16. At the very bottom, resting upon wall 11a and below the bottom pairof ribs 13, we provide a tray 120 which is slidable upon the wall 11::and which has an upstanding peripheral flange 121. The tray iscoextensive in area to the base of the recess 14 and is provided with afront handle 122 whereby it may he slid into and out of the secess 14through the acess opening 16.

From the foregoing, it will be apparent that while food is being-cookeddirectly upon the upper surface of the electrified grate 35, additionalfood can be conventionally cooked by means of the heating element 100,with the tube 100 being shielded in accordance with the structuredescribed above.

In certain instances, it is desirable to speed up the cooking of foodupon the upper surface of grate 35, by means of overhead broiling, andin some instances it is desirable to provide a complete cooking unithaving facilities for cooking foods by broiling or the like. This isaccomplished in accordance with the embodiment of the invention shown inFIGS. 10 and 11. In this embodiment, the lower unit is substantially thesame as in the first embodiment, except for the provision of additionalcontrols for the added overhead unit 151. This overhead unit 151 hasvertical hollow sidewalls 152 which rest upon the tops of the casingwall portions 12a. These walls 152 are connected by a rear wall 153 andalso by a top horizontal strut 154. However, the top of the unit 151 isgenerally open to permit the escape of heat and steam from theelectrified grate 35. A pair of units 136 are disposed within theinterior space of the unit 151, these units 136 0ptionally correspondingsubstantially to the sectional units 36 of the first embodiment. Eachsuch unit 136 is located adjacent a respective side 152 of the unit 151and is preferably arranged so as to be vertically adjustable. Instead ofa front rib, as shown in connection with the unit 36, the grate section136 is provided at its front with a laterally extending bar 170, securedthereto by screws 171. A similar bar, not shown, is aflixed to the rearof the unit 136. The bar extends outwardly of the unit 136 and extendsthrough an elongated vertical slot 172 formed in the wall 152. A pair ofvertically extending shafts 175 are journalled in the interior of thewall 152, only the front such shaft being shown. The shaft 175 isprovided, opposite the slot 172, with a screw thread 176. The outer endof the bar 170 is formed into a nut portion 177,

which is threadedly received upon the screw 176. With a similarstructure at the rear (not shown), it will be apparent that by turningof the two screws, the unit 136 may be raised or lowered. Any suitablemeans may be provided to turn the screws 176. Thus, as illustrativelyshown in the drawing, a horizontal crank shaft 180 is journalled in wall152, having a handle 181 outside the front of the wall 152. This crankshaft 180 has mounted thereon a worm gear 182 which meshes with a wormpinion 183 mounted upon shaft 175 above the screw thread 176.Accordingly, by turning the crank handle 181, the unit 136 can be raisedand lowered. The construction on only one side is shown, since it willbe apparent that the construction on the other side can be the same. Oneach side, the two wires from the rear of the unit 136 are drawnoutwardly thereof in a cable 185 of sufficient length to accommodate thefull upward position of the unit 136. This cable 185 is drawn to thebottom of the unit 150 and is extended outwardly through hole 186 in therear wall 153 into any suitable junction box 188 mounted upon the rearof wall 153. Although not shown, it will be apparent that additionalwiring may be connected within the junction box to the cable 185 andhence carried into the rear casing portion 13 and hence to the controlpanel 11b. Thus, FIG. 10 shows additional control knobs 90a on thecontrol panel 11b, which may be connected in circuit with the operativeelectric elements of the two units 136, similarly to the wiringarrangement shown diagrammatically in FIG. 9.

In the raised position of the two units 136, they may be used foroverhead broiling of food placed upon the electrified grate 35. In thelowered position of the units 136, they may be used, for example, toboil or otherwise cook food in pots placed upon the upper surfaces ofthe tubes of such elements 136.

Thus, it will be seen that we have shown a single unit which may beutilized for both direct and overhead broiling purposes, together withboiling or other conventional cooking of foods. In other words, in asingle compact unit, all cooking functions other than baking androasting can be performed in a minimum of space.

We claim:

1. Electrified cooking apparatus comprising a housing having a bottomwall, side walls and a rear wall defining a recess opening to the topthereof and having a front access opening, a first electrified cookinggrate, means mounting said first electrified cooking grate in saidhousing intermediate the top and bottom of said recess, the spaceimmediately above and immediately below said first electrified cookinggrate being unobstructed to permit placing food directly upon said firstelectrified cooking grate and to permit free flow of air around saidfirst electrified cooking grate, a second electrified cooking grate,means mounting said second electrified cooking grate on said housingwithin said recess and above said first electrified cooking grate, andmeans cooperating with the means mounting one of said electrifiedcooking grates for moving at least one of said electrified cookinggrates toward and from the other of said electrified cooking grates sothat said grates may be positioned relatively close to one another forreception of food directly upon said second electrified cooking grateand may be positioned relatively remote from one another whereby foodplaced upon said first electrified cooking grate for cooking can bebroiled from above by said second electrified cooking grate.

2. An electrified cooking apparatus as claimed in claim 1 wherein saidfirst electrified cooking grate comprises a plurality of straight hollowmetal tubes each containing a wire, and means clamping the ends of saidtubes, said tubes extending across said recess in spaced, generallyparallel relationship, the upper surface of said tubes being generallycoplanar to provide a cooking surface.

3. An electrified cooking apparatus as claimed in claim 1 wherein saidmeans for movably mounting one of said electrified cooking gratescooperates with the means for mounting said second electrified cookinggrate, whereby the position of said second electrified cooking grate ismovable between a position relatively close to said first electrifiedcooking grate and a position relatively remote from said firstelectrified cooking grate, at which time food placed on said firstelectrified cooking grate can be broiled from above by said secondelectrified cooking grate.

4. An electrified cooking apparatus as claimed in claim 1 and includingmeans for controlling the electrical input to said first and secondelectrified cooking grates for individual selection of the heating ofsaid first and second electrified cooking grates, whereby said first andsecond electrified cooking grates may be heated at the same time toprovide for the cooking from below and above of food placed on saidfirst electrified cooking grate.

References Cited UNITED STATES PATENTS 2,156,216 4/1939 Russell et a1.2l9455 XR 2,290,658 7/ 1942 Volks 99446 2,852,654 9/1958 Magin 99446 XR2,856,502 10/1958 Wolf 99446 XR 2,905,077 9/ 1959 Del Francia 994462,938,102 5/1960 Savio 99446 XR 3,023,298 2/ 1962 Wells 219-4453,166,006 l/1965 LennoX 99446 3,225,682 12/1965 Savio 99446 3,252,4075/1966 Buerki 99446 3,301,170 1/1967 Beasley 99446 XR WALTER A. SCHEEL,Primary Examiner.

JOHN M. NEARY, Assistant Examiner.

US. Cl. X.R.

